Inking means for duplicating machines



Oct. 27, 1925. 1 1,559,068

E. J. BRASSEUR 'INKING MEANS FOR DUPLICATING MACHINES Filed Jan. 31 1925 Patented Oct. 27, 1925.

UNITED STATES 1,559,068 PATENT OFFICE.

ERNEST J. BRA'SSEUR, OF CHICAGO, ILLINOIS, ASSIGNOR TO A. B. DICK. COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

mxme MEANS roa DUPLICATING MACHINES.

Application filed January 31, 1925. Serial- No. 5,945.

'means therefor, etc.

Heretofore ithas been customary to rely solely upon th natural permeationof ink through the inking pad of a duplicating machine, aided by the pressure placed on the outside of a pad durlng the printing operation, tobring the ink to the outside of a ad for transmission through'the stencil to eii ect reproduction. I have discovered that there is quite an advantage in forcing the ink through the pad by additional means, such as by establishing air pressure behind the ad, since such pressure forces ink outwardy through the pad and replenishes the outer surface thereof adequately and yery quickly. j I

Accordingly, one of the objects of my invention is to provide means for establishing air pressure on the rear of the inking pad after a general distribution of ink has been made on the rear surface thereof.

I have also discovered that a short ap-" plication of air pressure on the rear of a pad which has become quite dry from non-. use or from the congestion of ink thereon will restore the pad to usable condition. Accordingly, the o .ject of my invention is also to rovide means for reconditioning a pad whlch has become unsatisfactory for use on account of the drying out and congestion of old ink thereon.

A further object of 'my invention is to provide a simple, eflicient and practical construction for establishing suitable pressure 1 at the rear of the pad to force ink through the pad to replenish the outer surface thereof adequately and quickly.

Other objects of my invention will be in part obvious and in part pointed out heremafter.

In carrying out my invention, I preferably provide means for establishing air pressure in a compartment constructed immediately behind the inking pad when carried on the machine. In my prior application .Serial No. 7 26,465, filed July 17, 1924, for duplicating machines, and also in an application filed by me on even date herewith for duplicating machines, I have disclosed a sealed compartment immediately behind the inking ad, and means for making a general distribution of ink to the rear surface of this pad through a diaphragm over which the pad is placed. Any suitable means adapted to either manual or automatic operation may be associated with such compartment for establishing the desired air pressure therein, either contlnuously or intermittently, or only spasmodically as and when desired. The pressure-creating means may take the form of a suitable air pump.

In order-that a clearer understanding of my invention may be had, attention is herebydirected to the accompanying drawings, forming a part of this application and illustration one certain embodiment of my invention.

Referring to the drawings:

Fig. 1 is a diagram'riiatical view of a duplicating machine such as disclosed in my said prior application Serial No.;726,465, showing one possible means of creating thedesired air pressure associated therewith;

Fig. 2 is an enlarged end view of the air entrance ort into the compartment; and

Fig. 3 1s a. sectional view of the same, and is taken on the line 3-3 of Fig. 2.

Similar reference characters refer to similar parts throughout the several views of the drawings.

Referring to the drawings, 1 indicates a suitable support upon which the drum2 of the duplicating machine is mounted for rotation by means of suitable handle 8. The drum carries the diaphragm 4 and aninking pad 5. These elements 4 and 5 comprise a portionof a sealed compartment 6, which is constructed within the drum 2. This compartmenthas aside wall 7, and the drum 2 has an adjacent side wall 8. A nipple 9 extends through walls 7 and 8 and is-held in 100 place on wall 7 by means of an enlarged head 10 and'a nut 10 screwed upon the nipple, the head 10 and nut 10' bem on opposite sides of the wall 7. The hea 10 carries a conical metallic member 11, which at its en- 105 larged inner end has-aplurality of radial finger portions 11, which extend through suitable perforations in the side wall of J a cap member 12, the ends of fingers 11' being flanged over, as at 13, whereby the cap 12 110 giving it a few strokes.

is held in place. The cap 12 is imerted with respect. to the member 10. so that air entering through the nipple 9 and member 10 will be deflected rearwardly by the cap 12 and spread within the compartment 6.

It will be evident that when air is forced through the nipple 9 by any suitable means, there will be air pressure built up within the compartment 6. This air pressure will act through the diaphragm 4 against the inking pad 5 and will tend to force ink to the outer surface of the pad 5.

To create this air pressure, it has been found suitable to employ a simple hand air pump 14 of conventional form. This pump may be connected with the end of the nipple 9, which extends outside of the wall 8 of the drum, by means of asuitable tube 15.

The operation is as follows: After a gelleral distribution of ink has been made to the diaphragm 4, pump 14 may be connected with the nipple 9 and operated until a satisfactory quantity of ink has been forced to the outside "of the inking pad 5 due to the increased air pressure within compartment 6 resulting from working the pump. The pumpthen may be disconnected from the nipple 9 and the machine operated in the usual manner. If, at any time during the operation of the machine, it is found .that the outer surface of the inking pad 5 needs replenishment, this may be accomplished almost immediately by applying the pump and Should the inking pad 5 be unsuitable for use, due to drying or congestion of ink thereon, the pump 14 may again be used to build up air pressure within the compartment 6, whereby fresh ink will be forced to the outer surface of the inking pad 5, and the pad will be reconditioned for use.

Heretofore the customary manner of replenishing the outer surface of the inking pad with ink has been to either distribute more ink on the interior of the pad or to lessen the speed of cylinder revolutions to give time for the ink to permeate through the pad and to accumulate on its outer surface. By means of my invention, neither of these ways of replenishing the outer surface of the pad are necessary, since by the use of the pump the outer surface of the pad is replenished with ink almost) immediately and also very evenly, and accordingly it is possible to print more rapidly and with an assured abundance of ink.

Heretofore, when a pad has become quite dry from non-use or from ink congested thereon from long continued use, it has been customary to replace the pad or to turn it over. Both of these undertakings are very objectionable and time-consuming.

nseaoos The pads are, of course, covered with ink and it is a very dirty undertaking to handle them. This is now rendered unnecessary, since, as above pointedout, a few strokes of the pump will recondition such a pad.

Excessive air pressure cannot be created because the air above a certain pressure will find release automatically through the outer edges of the pad.

As many changes could be made in the above construction and as many apparently widely different embodiments of my invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall a be interpreted as illustrative and not in a limiting sense.

I claim 1. In a device of the character described,

in combination, an inking pad, and means for establishing air pressure behind said pad..

2. In a device of the character described, in combination, an inking pad, a compartment behind said pad, and means for estab lishing air pressure within said compartment and against said pad.

3. In a device of the character described, in combination, a drum of a stencil-dinlieating machine, a sealed compartment within said drum, an inking pad comprising a portion of the walls of said compartment, and means for establishing air pressure within said compartment.

4. In a device of the character described, in combination, an inking pad adapted to receive ink on one surface thereof, and pneumatic means for forcing said ink through said pan and to the other surface thereof. 5. In a device of the character described, in combination, an inking pad, means whereby a general distribution of ink may be made to one side of said pad, and pneumatic means forforcing said ink through the pad on to the other surface thereof.

6.. In a device of the character described,

in combination, an inking pad, an air compartment behind said pad, and means including an air pump for establishing air pressure within said compartment and against said inking pad.

7. In a device of the character described, in combination, an inking pad, an air compartment behind said pad and in open communication therewith, an air inlet port into said compartment, and a pump for forcing air into said compartment through said inlet port.

This specification signed this 28th day of January, 1925.

ERNEST BRASSEUB. 

